CUSUM Problem (CUScore): Consider the data in the Table, Column (A). The first 20 of those observations under normal distribution with =10, =1. The last 10 observations under normal distribution with =11, =1. Draw the Chart (UCL=13, CL=10, LCL=7). Conclusion?

Sample Size?

Obs, i	xi (A)
1	9.45
2	7.99
3	9.29
4	11.66
5	12.16
6	10.18
7	8.04
8	11.46
9	9.20
10	10.34
11	9.03
12	11.47
13	10.51
14	9.40
15	10.08
16	9.37
17	10.62
18	10.31
19	8.52
20	10.84
21	10.90
22	9.33
23	12.29
24	11.50
25	10.60
26	11.08
27	10.38
28	11.62
29	11.31
30	10.52

Conclusion?